Yes, Google, Yahoo, AOL, and Microsoft are right in the center of that chart, as you’d expect. But the diagram lists a broad spectrum of companies, demonstrating just how big the field is for deals. As Luma explains in a blog post about the chart:

The goal of the slide was to graphically depict all the likely strategic buyers of digital start-ups on one page. We anticipate this slide will be utilized in board presentations and investor meetings, and hope it provides utility to the industry.